Abstract
We present a demonstration of two error-correction coding schemes that can
successfully operate on a free-space optical (FSO) communication channel subject to
atmospheric turbulence. The codes (a puntured Low-density parity-check code and a Raptor
code) operate by continuously adapting the information rate to accommodate the varying
channel conditions. Because these coding schemes require the use of a feedback channel,
we evaluate the bandwidth cost incurred. The evaluation of the codes is performed
offline and uses experimental optical signals recorded from an FSO link. We analyze the
temporal characteristics of the experimental channels and compare the performance of the
codes for different bit rates to asses the effect of temporal correlation and imperfect
channel state information.
© 2010 IEEE
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